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Updated: Nov 17, 2025

Micro 3D Printing Using a Digital Projector and its Application in the Study of Soft Materials Mechanics
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Three-Dimensional Stretchable Microelectronics by Projection Microstereolithography (PμSL).

Yuejiao Wang1,2, Xiang Li2,3, Sufeng Fan1,2

  • 1Department of Mechanical Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong SAR, China.

ACS Applied Materials & Interfaces
|February 15, 2021
PubMed
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This summary is machine-generated.

Researchers developed a 3D printing method for advanced stretchable electronics. This technique enables high-resolution, complex 3D structures for applications in health monitoring and medical treatment.

Area of Science:

  • Materials Science
  • Electronics Engineering
  • Biomedical Engineering

Background:

  • Stretchable and flexible electronics are crucial for health monitoring and medical treatments.
  • Current technologies are often limited to 2D layouts, restricting complex designs.

Purpose of the Study:

  • To introduce a novel 3D printing microfabrication process for advanced stretchable electronics.
  • To overcome the limitations of 2D designs and enable complex 3D geometries.

Main Methods:

  • Utilized projection microstereolithography (PμSL)-based 3D printing to create microstructures.
  • Coated printed microstructures with thin gold (Au) films to create conductive elements.
  • Demonstrated the process with a stretchable capacitive pressure sensor array.
Keywords:
3D microelectronics3D printingadvanced manufacturingflexible electronicsstretchable electronics

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Main Results:

  • Achieved high resolution of 2 μm for 3D geometries.
  • Developed 3D conductive structures with exceptional stretchability (∼130%) and conformability.
  • Maintained stable electrical conductivity with <5% resistance change at 100% tensile strain.

Conclusions:

  • The PμSL-based 3D printing offers a versatile and high-resolution microfabrication process.
  • This method enables the creation of complex, integrated 3D flexible electronic systems.
  • The developed technique provides a simple, facile, and scalable manufacturing route for advanced electronic devices.